In this paper, based on the experimental and theoretical analysis, the primciple ofoptimum design for single lap joint of resin matrix, together with omposites ispresented the adhesive selection, the bonding length and the.hickness of the adhesivelayer and the adherend design. It is shown that by the optinum design the strength ofadhesive bonding is increased while the weight of the composites products is decreasedso that the quality of the products is improved.